Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

This section describes how to retrieve DBMS data by using the statements and components of the SQL Procedure Pass-Through Facility to access DBMS data. The Pass-Through Facility uses the SAS/ACCESS ...

Last time, I discussed how to get PowerShell and SQLPS up and running on your machines. And much like my dog chasing its tail, you're probably asking yourself, "Now that I have it, what do I do with ...

Do you want to find out how to avoid duplicates in the results of a SQL SELECT query? This article will show you how. Simply use the DISTINCT clause and between the SELECT clause and the fields.

SQL is about as easy as it gets in the world of programming, and yet its learning curve is still steep enough to prevent many people from interacting with relational databases. Salesforce’s AI ...

A query-expression is one or more table-expressions. Multiple table expressions are linked by set operators. The following figure illustrates the relationship between table-expressions and ...

The beauty and joy of a relational database is the concept of relational closure—everything is a table. Beyond the eponymous table, query results are also “tables.” Any query serves as a table to be ...

Folks relate to physical tables; even the most non-relational-minded person can picture a fixed structure file and equate that to a table and its columns. The spreadsheet image is ubiquitous.